Telephone subscriber line concentrating system



June 18, 1968 RYOKICHI TORISU 3,389,229

TELEPHONE SUBSCRIBER LINE CONCENTRATING SYSTEM Filed July 21, 1966 1o sheets-sheet 1 S m .mi @@@J INVENTOR R.TORISU BY Mr ATTORNEY June 18, 1968 RYoKlcl-n 'roRlsu 3,389,229

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' INVENTOR R.TOR\SU BY 7M' /Q/v ATTORNEY June 18, 1968 RYoKlcl-n ToRlsu TELEPHONE SUBSCRIBER LINE CONCENTRATING SYSTEM 10 Sheets-Sheet 5 Filed July 2l, 1966 ...Mmm

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ATTORNEY 10 Sheets-Sheet. 4'

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RYOKICHI TORISU secton. F. ,7 TvunKCrcurt .9

TELEPHONE SUBSCRIBER LINE CONCENTRATING SYSTEM June 18, 1968 Filed July 21,

INVENTO R R. TORIS U BYM/Q'f ATl- RNEY Tru 'laRemoUmt (section 2) To Remote Ufntl (Seclonl) June 18, 1968 RYoKlcHl ToRlsu 3,389,229

TELEPHONE sUBscRIBER LINE CONCENTRATING SYSTEM Filed July 2l, 1966 10 Sheets-Sheet 5 fl l wsmlmnvm mog@ Neptun: N .rhow llk N :A .Coww

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ATTO RN EY 10 Sheets-Sheet 6 ATTO RNEY June 18, 1968 RYomcHl ToRlsu TELEPHONE SUBSCRIBER LINE CONCENTRATING SYSTEM med my` 21, 196e June 18, 1968 RYoKlcHl ToRlsu TELEPHONE SUBSCRIBER LINE CONCENTRATING SYSTEM 10 Sheets-Sheet 7 Filed July 2l, 1966 ATTORNEY .Tune 18, 1968 RYoKlcHl Tomsu 3,339,229

TELEPHONE SUBSCRIBER LINE CONCENTRATING SYSTEM Filed July 21, 1966 1o sheets-Sheer 5 w. u l l |I/ \NVENTOR R TORISU Sm. Bm e Es 8.53 Q .mi

ATTO RN EY June 18, 1968 RYoKlcHl ToRlsu 3,339,229

TELEPHONE SUBSCRIBER LINE CONCENTRATING SYSTEM Filed July 2l, 1966 10 Sheets-Sheet 9 29:8 we w ss Q mw 4 R uw W m man W A Y B mmmfumv Mdma vl L June 18, 1968 RYoKlcHl ToRlsu 3,389,229

TELEPHONE SUBSCRIBER LINE CONCENTRATING SYSTEM Filed July 2l, 1966 10 Sheets-Sheet 10 United States Patent O 3,389,229 TELEPHONE SUBSCRIBER LINE CONCENTRATING SYSTEM Ryokichi Torisu, 1657 Mure, Mitaka-shi, Tokyo, Japan `Continuation-impart of application Ser. No. 352,860,

Mar. 18, 1964. This application July 21, 1966, Ser.

Claims priority, application Japan, July 5, 1963,

7 Claims. (Cl. 179-18) ABSTRACT OF THE DISCLOSURE A simplified line concentrator has trunk lines connected in accordance with a unique arrangement to corresponding Vertical `paths of special cross-bar switches at the central otlice and remote units, respectively. The horizontal paths of the remote switch are connected directly to a number of subscribers lines larger than the number of trunks and those of the central office switch are correspondingly connected directly to subscribers terminals of the automatic exchange. A control section at the remote switch is counected via a common control circuit to a like control section :and a chain section at the central office switch for effecting connections through the trunks on demand, and for performing related functions. The chain circuit is made up of contacts of the trunk relays of the respective trunk circuits, and xes the operating order of the trunk circuits. The unique connection of the lesser number of trunks to the vertical paths enables the number of trunk lines extending between the units to be varied as a function of subscriber traiiic. The special cross-bar switches have at each crossing point not only a set of normally open contacts closed by operation of the switch to connect the subscriber lines and subscriber terminals to a trunk, lbut also have at each crossing point .a :set lof normally closed contacts which are opened as the switch is so operated. The normally closed contacts associated with crossing points of the horizontal paths of a subscriber are themselves connected in series forming a demand signal circuit from ground through the subscribers lines (or terminals) to the contr-o1 circuit. When the connection of the horizontal paths to .a trunk through the vertical paths is effected, enabling ground potential to be applied through the trunk from the calling subscribers hook switch, the opening of the normally closed contacts at the crossing point releases the control circuit. The -circuitry is simplitied by the combination which also enables the trunks to be released promptly after their use lby a calling party has been completed.

This application is a continuation-in-part of my copending now abandoned application Ser. No. 352,860 led Mar. 18, 1964, the priority of which is claimed for all common subject matter.

The present invention relates to telephone systems, and, rnore particularly, to subscriber line concentrating systems.

Each subscriber station, or substation, normally requires a pair of wires to connect it with the central office. For .a substation which is located at a distance from the central otiice, a large portion of the cost of installation andoperation of the substation `is that of the wire used in subscriber loop between the substation and the central otiice. The utilization of line concentrating systems is attractive, especially where the outside plant costs are high and the distan-ces between groups of substations and the central office are large while the number of substations and the amount of local interconnecting traffic among the substations is not adequate to justify their connection to a separate community dial otlice.

Pice t As the central otiice is not directly in information com- -munication with the subscriber lines, due to the interposition of the remote and' central office units of the line concentrator, it is generally necessary in such systems to provide a number of control leads for testing and controlling the line concentrator. In order to obtain the greatest saving in telephone plant, it is desirable to have a high ratio between the subscriber andi trunk lines connected to a remote line concentrator, while keeping the number of control leads required to pass information signals to and from the concentrator to a minimum.

It is a general object of the present invention to provide an improved communications :system in which a large number of subscriber lines may be individually connected to a central oice by a smaller number of common trunk lines, whereby considerable savings is attained.

Another object of the present invention is to provide a line concentrator system which effects economies in the wiring connecting central otiices with subscribers substations.

It is -a further object of the present invention to provide a line concentrating system which is usable with all kinds of automatic telephone systems, including step-by-step systems, common control systems, and others.

Another feature of the present invention is that it allows considerable reduction in the conventional otlice equipment Ithat would otherwise be required.

Various types of line -concentrators are known, none of which, however, has the advantages of that of the present invention. Herein each cross bar switch for connecting individual subscriber lines to trunk lines is divided into several groups of contacts, each group including a plurality of horizontal paths to which subscriber lines are connected, and a plurality of vertical paths t-o some of which trunk lines are connected. Some of these vertical paths are connected individually to trunk lines (viz talking trunk lines) and the other vertical paths are led to several groups by connecting them with one another, and each group is connected t-o a trunk line. Therefore a number, less than all, of them are connected individually to the trunk lines. The operation whereby the number of vertical paths is reduced to the number of trunk lines is called grading The number of trunk lines (viz talking trunks) depends on the volume of subscriber traffic, and can .be made larger or smaller, depending on the demand for the trunks. The feature of a variable number of talking trunks is a distinct advance over conventional concentrating systems, wherein the number of subscribers which can be accommodated and the number of trunks is fixed. Consequently, the line concentrator of the present invention can always be utilized to its full capa-city, so that substantial savings can be realized. Moreover, the number of relays required by the present invention is few compared to the number required by prior art devices, and the cross-bar switch can -be smaller than those previously used. In particular, the remote unit (which is the unit of the line concentrator located in the vicinity of the subscribers) requires but a single trunk relay for each trunk circuit, and only four to six relays for the common controlling device. Two to three relays are sufficient for each trunk circuit in the line concentrator unit located at the central oce, and if the two-party line discriminating relay and the trunk hunting switch for the central ottice selectors are provided in the trunk circuit of the office unit, the central automatic exchange equipment does not require any more t'woJparty line discriminating relays and can reduce the equipment of line relays, cut-off relay-s and line nders (or line switches) for the step by step system, and generally the main distributing frame may be made small, and its wiring is simplified.

The net result of these features is that since the cost of conventional automatic exchange equipment is almost ...t equal to the lcombined cost of the automatic exchange equipment and the line concentrator, the cost savings resulting from use of the present system may be regarded as a net savings. Its operation is rapid, and precise, having almost no effect on the connecting operation of the automatic exchange. Moreover, the invention permits separate suspension Iof calls originating within the oiice regardiess of the 4class of subscription of the caller, whether they are party-lines or individual lines. Thus, by using the line concentrator in suburban communities, the subscribers who are 'billed on the basis of toll rates can be accommodated `by an exchange office located centrally of the suburban areas, to render exchange service as a separate independent office, so that marked economics in equipment and maintenance result. The inventor has given the name Independent Exchange Ofiices Assembling Syste-m Ato the new system `by which several toll service areas subscribers are simply assembled in a central office as several independent telephone exchange offices.

The line concentrator according to the present invention does not have any extraneous effect on the switching operation at a cross-bar type exchange, where a common control system is in use. To subscribers located at a comparative distance from the exchange, speaking and ringing currents maybe supplied from the remote unit, and the dial impulse which occurs upon originating a call can be relayed by means of both wire impulses in the remote unit. Addition of various functions, such as discriminating bctween party and non-party lines, has increased the number of relays required in the trunk circuit only insubstantially, t-o three; one relay was required formerly. And for release, a release relay is used in place of a discharge tube; therefore, operation has been stabilized, with no major change in net price. Other associated circuits in the line concentrator are quite the same as in the case where the number of relays in the trunk cir-cuit is reduced to one.

The a-bove is the description of an application of this line concentrator to an automatic exchange, but it is also very convenient to generally use for the transmission of signals between specified point-s. Explanations with reference to diagrams will be given below.

FIG. l is a schematic diagram lof a case where ll trunks and a pair of control lines are -used for 48 (96 lines in case of two-party line) individual lines accommodated by dividing `a cross-bar switch into 4 parts.

FIG. 2 is a circuit diagram of the remote unit of a line concentrator employa'ble in FIG. 1.

FIG. 3 shows a variation of the circuit diagram shown in FIG. 2 which has been changed so as to supply the speaking and ringing currents, to relay dial impulses, and to give the discriminating function of two-party subscription.

TABLE .IL-LOCATION INDEX OI` FIG. 4 shows the grading providing ll trunks lby dividing a cross-bar switch into 4 parts.

FIG. 5 shows the trunk circuit of the line concentrator which enables one to effectuate, within the ofiice, separate suspension of originating calls regardless of the kind `of subscriber concerned, i.e., whether an individual line subscriber or a party-line one.

FIG. 6 shows a variation of the trunk circuit shown in FIG. 5 and at the same time a part of the common controlling device directly concerned is sli-own as well.

FIG. 7 shows the trunk circuit of the line concentrator on the exchange ofiice side in the case wherein the automatic exchange system uses the same route for originating and terminating calls.

FIGS. 8 and 9 shows the trunk circuit on the exchange ofiice side. The diagrams have `been obtained by excluding the separate originating call suspending function from those shown in FIGS. 5 and 7 respectively.

FIG. 10 shows the common controlling circuit of the line concentrator on the exchange office side in the case wherein the calling subscriber accommodated in a cross- -bar switch divided into 4 parts is identified by an AC power source with associated rectifiers.

FIG. 1l is the common controlling circuit of the case in which the and batteries are supplied alternately by means of the intermittent contacts in place of the AC power source shown in FIG. l0.

FIGS. l2, 13 and 14 are diagrams of portions of office unit circuitry for facilitating detailed description of separate originating call suspending function and the detail of `a cross-bar switch.

FIG. l5 illustrates the arrangement of FIGS. 2, 5 and 10 to constitute a line concentrator system according to FIG. 1.

Explanation of this invention making reference to the diagrams is given below. In order to facilitate an understanding of the invention, and how the several gures are related, the several sections of the line concentrator remote and central ofiice units have been block outlined and identified by legends in the figures. Also in the drawings and description the convention is adhered to of designating relays with capitalized reference letters, and the contacts thereof with corresponding lower case letters, viz-relay G1 with contacts g1, relay A with contacts a, etc. Like relays for different subscribers are identified by like symbols with added numerals, e.g. G01, G02, SM1, SM2, etc. Finally, in order to facilitate location of the various relays, resistors and other elements to be referred to in tracing the operating circuits and avoid need to repeatedly refer to the location of such elements in the text, such locations are indexed in detail in Table A, following:

PRINCIPAL ELEMENTS OF DRAWINGS Reference Figures Letters Element Name 1 2 3 5 6 7 8 J l() 1l 12 13 14 A Relay, impulso AB Rel B BA BB Booster Battery ]3&TL BC A serios of Cross Break TR TR TR TR TR Contacts of XB. BC A series of Cross Break TL TL Contacts ol' XB. RL Relay, release C BS Relay rou assi ninnr LC LC B Reisfg p g D C BL Il Bil Cl Clo/Cb Cr DIS F (Y.

Reference Fi ures Letters Element Name g GK Relay G 0 Relays, originating group..

GS Relays, group assigning.

Holding Magnets (XB Sw) Holding Magnets (XB Sw) TL TL Relay L Relay, line Bol y R lay R Rotary lllagnct S Relays, terminating group BR Subscriber Line i. TL TL TL Selecting Magnets (XB Sw) Selecting Magnets (XB SW) R R 'I Relay, trunk TR T o Relay, termination indicator Retardation Coil EL Relay Cross Bar switch (otlico unit). TR Cross Bar switch (remote unit) TL TL TL Relay, Start C C Relay LC E=extre1ne- L=leit. R=right. C=ccntor.

To facilitate an understanding of important parts of the illustrated embodiments hereinafter described in detail, it should be initially appreciated that in the present invention a special cross-bar switch is employed at the remote unit and a similar special cross-bar switch is employed at the othce unit. The cross-bar switch XB' at the remote unit (XB at the oiiice unit) is divided into a number of parts, each of which comprises a plurality of horizontal paths and a plurality of vertical paths, interconnectable at the crossing points by normally open contacts (XB', FlG. 2, Section l; XB, FIG. 5, Section 1). Subscribers lines SB are directly connected to the horizontal paths in the remote unit, i.e. without the intcrposition of line and cutoff relays, and subscribers terminals CT are directly connected to the horizontal paths in the ofce unit, i.e. without the interposition of any sleeve and cut-olf relays. The vertical paths are in part interconnected (as illustrated in FIG. 4) to form a number of vertical path sets less than the number of vertical paths. These vertical path sets correspond in number to a number of trunks through which they are connected from the remote unit to the central olice unit, which number of trunks is less than the number of subscribers lines. The cross-bar switch at each unit also includes a separate set of contacts (FG. 2, Section l BC', BC; FIG. 5, Section 1, BC) at each crossing point which are normally closed. When the cross-bar switch is operated to close the contacts XB or XB between the horizontal and vertical paths at any given crossing point, the normally closed set of contacts BC or BC at that crossing point is opened. The sets of normally closed contacts BC' or IBC at the respective crossing points of each horizontal path are connected in series. Thus when the cross-bar switch is operated to close the make contacts to connect a horizontal path to one of the five vertical paths of the switch division, such operation opens the break contacts through which ground was applied to the control circuit while the subscribers line was demanding connection to a concentrator trunk, thus freeing the control circuit for use by other calls, and the maintenance of this operi circuit until the cross-bar switch connection is released enables the seized trunk to be released as soon as the call is iinished and the controlling handset is hung up. Turning now to the specific embodiments shown in the drawings, and referring first to the general diagram, FIG. 1, the line concentrator employs on each side (that is, the subscriber side and the central oflice side) one cross-bar switch which is divided into 4 units; l2 subscriber lines SB are accommodated in each divided unit, then 48 subscriber lines SB are accommodated in one cross-bar switch, and 5 vertical paths are led out for every divided group, and the 5 vertical paths per group totalling 20 vertical paths, are concentrated to 11 trunks T/'51 due to the grading conducted among the divided groups. n the exchange oliice side each trunk is connected to the selectors of the automatic exchange via a rotary switch, and also is connected to the connector bank via subscriber line terminal CT of the same. The common controlling device CTL of the remote unit of a line concentrator and that CTL of the ofiice unit Of the one are connected by a pair of control lines Ct1.

FIG. 4 shows the diagram of the switching mechanism and the composition of the trunks, and is an example in which one cross-bar switch is divided into 4 parts, and after conducting grading l1 trunks are provided. The number of trunks is variable at will to 8, 9 11 or 12, etc. depending on the call volume. T he cross-bar switch in this example is assumed to have selecting magnets SM1 to SM12, and holding magnets H1 to H20; therefore, 12 subscriber lines (24 subscribers, in case of 2-party lines) per divided unit, for a total of 48 subscriber lines (96 subscribers, in case of 2-party lines) and ll trunks are used.

FIG. shows the trunk circuit of the fifth trunk (Tr) of the trunks (from Tf1 to Tr11) as shown in FIG. 4. This invention is so designed that one cross-bar switch is divided, in the manner described above, into several units; each divided unit accommodates a separate group of subscriber lines; determines the trunk utilization order; conducts grading among the vertical paths used by each group; varies the composition of grading depending on the call volume of subscriber lines to effectively determine the number of trunks required; always only one holding magnet carries ont operation. This is one of the excellent features unobservable in conventional line concentrators. Because the utilization order of trunks Tr is determined by one trunk relay K provided in the trunk circuit on the exchange office side, the process of determination of the trunk utilization order is simple, and the operation is quick and efficient. Besides this, the trunk circuit in the exchange oce side is provided an originating call discriminating relay P, a rotary switch (its niagnet R) which saves some parts of an automatic exchange equipment having different originating call and terminating call routes, and a magnet R which drives the rotary switch. In the trunk circuit on the outside oliice side, e.g. FIG. 2, only one trunk relay T is contained, and besides this only a single discharge tube GL is provided, and even in the case where the speaking current has to be Supplied locaily due to long distance as in FIG. 3, only trunk relay T', auxiliary relay B, two-party line discriminating relay P', and release relay RL are provided as shown. As to the common control circuit it contains only impulse relay A, FIG. 2, start relay C and individual-group relays G1 to G4 representing much simplification in composition of the equipment. As a result an insertion of only one trunk relay T (or several relays for FIG. 3) in the outside trunk circuit enables to increase one trunk circuit, and in the exchange office the number of trunks can be increased in the like manner.

In FIG. 1 one cross-bar switch has been divided into 4 groups; each group accommodates l2 subscriber lines or line terminals; each group is provided with 5 vertical paths totalling these trunks are, by grading concentrates to ll trunks (Tr1-Tr11) to which common controlling device CTL' and CTL are provided; a pair of control lines Ct1 connects CTL and CTL, and if necessary, a. rotary switch which connects the line concentrator to the automatic exchange efficiently may bc inserted irllO each trunk.

DETAILED CIRCUIT DESCRIPTION (l) Originali/zg call (Le. subscribe1"s call t'r'a re/fnolc unity-Briefly: As is hereinafter explained in more detail, in originating a call via the remote unit, lifting of the hand set of the subscribers telephone set closes the hook switch of the telephone set, thus grounding one of the two control lines (C1 and C2 in FIG. 2 viz C1 and C2 in FIG. 10) via the series of the cross break contacts BC of the horizontal path in the cross-bar switch XB. A circuit is thus completed which energizes the originating group relay (G01, FIG. 10) which in turn operates a group assigning relay GS1, FIG. l0 which determines priority. Operation of GS1 operates office unit start relay ST in FIG. l0, which actuates two step relay BS (FIG. 5) to its rst step position causing wipers fm1 to m13 (FIG. 5) to rotate to an idle selector of the automatic exchange. Completion of this operation causes the two step relay B5 (FiG. 5) to take its second step, which seizes the automatic exchange equipment and grounds the RT wire. The sequence of operations then causes the selecting magnets SM1 to SME of the cross-bar switch at the oliice unit (FIG. 4), and the corresponding selecting magnets SM1 to SM'12 of the cross-bar switch at the remote unit to shift under the influence of an impulse relay I until the croSs-bar switch selecting magnet (SM1) associated with the calling subscriber is operated. This ccndition initiates operations which energize the holding magnets associated with the vertical paths through the cross-bar switches to which the available trunk is connected. The subscriber at the remote unit is thus connected to the control oflice equipment via the cross-bar switches and trunk lines of the line concentrator and may proceed to dial his call in response to the dial tone. Having affected the trunk connection of the rernote subscriber to the central oliice equipment and arranged for holding of that connection until released by the calling subscriber, the control circuit equipment of the line concentrator is released. In more detail: Circuit operation is described referring to FIGS. 2, 5 and l0. FIG. 2 shows a subscriber line of the first group and trunk circuit "I1-5. When a subscriber Of this subscriber line SB lifts his handset from his telephone set, the control line C1 is grounded through the subscribers loop and the series of the cross break contacts BC of XB, thea relay G01 at upper left of FIG. 10 operates by the route of SG (AC power source-commercial frequency is usable with rectifiers QC)-g01-g02g03g04-G01 (originating group relay)-QC1-ab1l-C1 (FIG. 2) Crgq-gg-d-QLT g1-Q01-BC-(-) wire SB- subscriber SB (-1-) Wire -BC-grouncl, and sets up its holding circuit by the route of battery-r/z-go1x-G01-QC1-crb1-l-C1 IBC-ground (FIG. 2) as shown in the relay G01 operating route, and SG is cut ofi". At this time if a subscriber in the third group is lifting his handset, it may happen that the group relay G03 (upper left of FIG. l0) goes into operation simultaneously. However, referring to the center of FIG. l0, G81 (group assigning relay) operates by the route of battery-GS1-g01-go2-go3-go4-.r4-s3-s2- s1-st-ds-ground. The design is such that as to group relays the priority order goes from G01 to G04 and in case of group assigning relays the priority order goes from GS.1 to GS1 and always only one group assigning relay will operate. By the operation of GS1 the start relay ST at left of center Of FIG. IO, operates (via circuit from battery at extreme right of FIG. l0, r6, ST, s4, s3, s2, s1, gsg, gs1, dis, to ground) to set up the holding cirw cuit of GS1 (from GS1 via gs1, st, dis to ground). In the case where K1 to K4 are operating, trunk relay T5 shown in FIG. 2 operates via the wire of trunk circuit of the trunk T15 shown in FIG. 5 to cause start relay C' to operate due to the operation of ST. Although relay L shown in FIG, l0 sets. up an operating circuit' in series with relay A via the (-l-) wire ol the trunk circuit shown in FIG. 2, contact x is the quickest to make and assists the completing operation of L and the circuit of A is opened, therefore, A will not operate. In FIG. when ST operates two-step operation relay B5 makes the irststep operation to close contact b5, therefore, rotary magnet R5 assisted by self intermittent contact RIS causes wipers rm1 to m13 of the rotary switch to rotate until they come on to an idle selector of the automatic eX- change. When an idle selector is selected current flows through another winding of B5, therefore, B5 makes, at once, the second step operation to close contact b5. By this means the automatic exchange side is immediately made busy and simultaneously a loop for and (-1-) wires of the automatic exchange is set up, and also ground is sent to RT wire from the automatic exchange side. (However, the case shown in FIG. 6 is, as will be described later, somewhat diiferent, but as shown in FIG. 6 two relays B5 and B5 are usable instead of relay B5 By the operation of L, the holding routes of group relays are disconnected, therefore, GO1 releases. Relay TS operates by the circuit of battery-gs1-gs2-gs3-gs4-s-TS- f-gk-gs3-gs4-l-C C1-g4-g3-c-QG1-g1-G1ground. Still referring to FIGS. 2 and 10, individual-group relay G1 does not operate because of the high resistance winding of TS, but relay BS operates (battery-BS-ts-ground) and relay F operates to set up its own self-holding circuit. G1 operates by the circuit of battery-gs1-gs2gs3- gs-is-QR-is-BS-bs-f-gk C1 C1 G1-ground; BS is held and TS releases. The holding circuit of G1 is set up by the route of battery-rg-ds-st-rg-gsl-k1 k5(-) wire wire-t5g1x-G1-ground. By the operation of G1 BS releases because its holding circuit is opened; relay GK operates to set up self-holding circuit, and F releases. By the operation of GK relay B operates through the operation of the intermittent Contact x1 or x2 (a standby to be used alternately with x1) provided from other circuitry, and when the intermittent contact x1 opens relay BA operates and relay I makes intermittent operation perfectly in accordance with make-break of the intermittent contact x1. By the operation of GK relay C is put into operation, therefore, the order selecting magnets SM1 to SM12 will shift from SM1 to SM12 according to the intermittent operation of impulse relay I; relay A also undergoes intermittent operation in accordance with relay I by the route of battery-rg-dis-st- 1'.1i-Z-gs1k1 /c5-(-|-) wire (Jr) Wire-t5-A- ground, and selecting magnet SM1 operates by the route of battery-gk-s-gsy-gsZ-I-Cg C2-g2-g1-QS-a-c- SM1ground and SM1 is held by the route of batteryrz-dz's-st-rs t5-r22 SH12-SM1-ground- Thus the order selecting magnets SM1 to SM'12 also shift from SM1 to SM12. When C is released by the operation of SM1, the rst-step of shift, and hunts for the calling subscriber by the route of battery-gs1-GO3-QC3-gkgSa-gS/rl-Ci C'1g4g3'-QLl-gl-QL'i-SM'i-BC' SB-calling subscriber-SB IBG-ground. Then G03 will operate. By the way of battery-IS-fc-gk-goagor-gk-st-ds-ground, impulse stop relay IS operates to set up self-holding circuit immediately. I is held at the position of operation or non-operation, and the shift of selecting magnets stops simultaneously both inside and outside of the oitice. Relay TS operates by the way of battery-is-TS-f-is-gs1-gs2-l-C2 Cg-gg-gr- QH-gg-ga-gz-grty-HMTRT-ground; BS operates; F operates to set up its self-holding circuit; holding magnet HM5 operates and is held by its residual magnetism, because condenser CO has been charged by battery BB at the time of the operation of IS, therefore, two fold voltage is applied to holding magnet HM5 by the route of TS releases by the operation of F, T5 releases by the operation of HM5 and BS releases by the restoration of T5. Holding magnet H5 operates by the route of battery- H5-z5-b'5-k5 k1-gs1-s-f-lvlR-ground and becomes self-holding via RT Wire. Marginal relay MR operates simultaneously with H5 to operate release relay DIS and DIS sets up the self-holding circuit, but it will release when all the relays in operation release, and will be able to cater tothe next call. Still referring to FIG. 5, by the operation of H5 trunk relay K5 operates to free trunk Tr5 from the common controlling device. CTL. If it so happens that holding magnet H5 releases: while the common controlling device in the otiice side is operating because of another call, though the remote unit will release, but to prevent misconnections K5 remains held as it has another holding circuit of battery-I l5k5-disst-ground so as not to release until the common controlling device being used releases after completing the connecting operation. In other words, if the common. controlling device on the exchange office side is operating although the trunk being used will release but the trunk relay K will not release. And it is so arranged that unless the rotary switch has selected an idle line, contact b'5, will not make and the holding magnet will not operate. In the case of FIG. 6 when rotary magnet R5 hunts for an idle line, relay B5 operates to hold the idle line as a busy line because the RT wire of this idle line has ground via contact b5, and the subscriber loop for the automatic exchange will be completed after the operation of H5, ground also comes to RT wire from the automatic exchange side, and when the circuit of slow release relay B5 is opened by the operation of K5, ground on the RT wire which has been given by the contact b5 will be lost by its release. The wire that goes to the selector in the automatic exchange does not pass through the crossbar switch cross contact XB, but the wire passes through the subscriber line terminal side of XB and the line terminal side is divided, for a two-party line, into two of which one passes through jack J1, and the other through jack I2 enabling to separately suspend originating call from a party line. By making RT wire busy by jack J3 the reason for suspension of call can be explained by means of a tape recorder, therefore, this is very convenient. It is Very simple to arrange so as to earth one wire or both of a subscriber line at the beginning of rotation and at the end of release, or conversely at the end of rotation and at the beginning of release of a subscribers dial, and if such a dial as described above is provided for one lparty of a two-party line, by such dial relay P, being of differential winding type, operates through its one winding to hold with the holding winding. By this means RT wire is connected to subscriber fee meter M1 or M2, FIG. 5, providing for separate registration of a two-party :subscriber and aforesaid separate suspension of originating call as well. In this FIG. 5 the (-1-) wire has been extended through the line terminal side, but it is also possible to extend the wire through the line terminal side. The rectiers inserted parallel to the differential windings prevent relay P from operating even if one party of a two-party line should dial a call while his co-subscriber is speaking to another subscriber. Explanation has been made of a two-party line, but the same principle is applicable to party-lines in gen-eral.

(2) Releases (Le. by the subscriber hanging lip his zalzdset.-When the calling subscriber hangs up his hand set, ground on RT Wire of the automatic exchange is lost; relay B5 (B5 at FIG. 6) and holding magnet H5 release; then l5() v. is sent to Wire till slow release trunk relay K5 is released by the restoration of holding magnet H5 and lighting neon lamp NL5 stabilizes discharge of discharge tube GL5. Residual magnetism of HM5 is neutralized by discharge current of GL5 to make it release. But the holding circuit of the trunk relay K5, which is usually released by the restoration of the holding magnet H5, is released by the operation of disconnecting relay DIS of the common controlling device which means that K5 is not released by l-l5 to save a subscriber from mis-connection while the common controlling device is working for the one.

(3) Terminating call (Le. connecting to n subscriber va a remote nnz).-Briefly, a call reaching to a subscriber Via the line concentrator from the automatic exchange equipment, is connected through the line concentrator in a quite similar manner as well as in the originating call, except that terminating group relays S initiate the operation, instead of the originating group reiays GO, group assigning relays GS determining the group, and except that the terminating call has priority in the line concentrator over an originating call.

In more detail when line terminal CT of the line concentrator is caught, as in the case shown in FIG. 6

Section 3b of which includes portion of FIG. 10), terminating group relay S1 out of S1 to S4 is put into operation by the route of r--Si-i battery-rZ-Ql-Si-S3-Szegabi-SiQ'i-B C-.Ts-RT ground Priority order among S1 to S4 goes from S1 to S4 and is reversal of that of group assigning relay BSl to B54. When S4 operates first, others do not operate so that only B84 operates, but in the case Where S1 operates, S2 operates, S3 operates and S4 operates, that is, even if all of S1 to Si, happen to be put into operation, it is so arranged that only GSI out of GSI to G54 will operate. In other words, only one group assigning relay will operate (just as in the case of originating calls), and between originating and terminating calls the latter have priority. This is due to the fact that in case of terminating calls the connecting operation of the automatic exchange has already been completed. In the case of FIG. l() when S1 operates BSl operates; terminating indicating relay TC operates to open the operating circuit of B5, and ST operates to set up the holding circuiLs of TC and BS. In either case of originating or terminating calls this controlling device will not get into a smooth running order until operation of the office unit start relay ST. Operation thereafter is quite the same as in the case of originating calls, therefore, explanation has been omitted. However, the only difference is that even it G03 or GO,z should operate for an originating call from a subscriber, relay IS would make no operation if the terminating operation is in progress but would operate by the route of battery-IS-gk-MRl-gsl-srnl-BC-Ig-RT ground. Note-worthy is the fact that assuming G01 is operated by the calling subscriber to start the common controllingr device, and the connecting operation is in progress, but before the operation of IS the terminating group relays are started, and among the terminating group relays there is a terminating group relay which indicates the same group as the group assigning relay operated by the calling subscriber7 and the called subscriber is controlled by contact sml and the calling subscriber is controlled by contact mg; in Stich a case because a terminating call has priority in the Order Selective Circuit (SM1 to SM12 or SMl to SMH), therefore, TC and IS will operate as described below to set up connection for the terminating call enhancing the eh'iciency of the automatic exchange; and even if the calling subscriber happens to be controlled by the same contact rml as the called subscriber, the operation of the Order Selective Circuit on the outside office side is delayed as long as the interval required for relaying of the intermittent operation of I by A more than the operation of the Order Selective Circuit on the exchange oce side driven directly by make-break of I is, and if the selector has not been caught, IS and TC operate simultaneously by the route of TC-st-tc battery-ta-IS-gk-WR|gsl-smr--Itl-Jr--R'l ground tn release Rb, and tbc holding magnet operates to connect thc terminating call with priority without sending out a call signal. In this instance if the selector has already been caught a terminating connection is set up holding the originating route of the line concentrator as it is, and the calling subscriber via the remote unit of the line concentrator can answer to the call coming from the oce unit of the one after deadening the dial tone by dialling once, or the originating subscriber via the remote unit being called by the terminating connection can hang up his handset, or the calling subscriber can continue the connecting operation to his desired subscriber Without taking any other step for the terminating call.

(4) Other modiycatz'ons.-The trunk circuit shown in FIG. 7 is used for a common control type automatic exchange, etc. using crossbar switches which utilize the same terminal for both originating and terminating calls and compared with the aforementioned it is very simpliied. However, it has quite similar operations to those mentioned before, that is B5 and B5 operate only at the time of originating calls; paths of cross-contacts for originating and terminating calls are dilerent; in case of originating calls the holding magnet is held by slowrelease of B5 until ground comes from RT wire of the automatic exchange; a terminating call has priority over an originating call; two-party line discriminating relay P5 enters into the speaking circuit only at the time of originating calls; it is similarly capable of separate suspension of originating calls, but, as shown in FIG. 9, if B5 is omitted by excluding the separate originating call suspending function, P5 enters into the speaking circuit even in the case of terminating calls. Exchanges in the sendout direction of the ringing current are carried out by the speaking current feeding circuit of the automatic exchange, and no change is required in the connecting operation of the automatic exchange. In case the common relay is put on the line terminal side, and its operation is controlled by the common controlling device of the automatic exchange, then relay P5 and contacts for M1 and M2 of the cross contacts shown in FIG. 9 are unnecessary, and the sendout direction of the ringing current is determined by operation or non-operation of the two-party relay of each subscriber line controlled by the automatic exchange. However, it is not so easy to separately suspend originating calls of a party-line subscriber. And in this case it is not possible to lessen the price of the exchange equipment as much as that of Stepby-Step Automatic Exchange, That is, the cost of the line concentrator will represent the increase in the equipment cost as it is, therefore, the actual saving in the exchange oice will be the balance obtained by deducting the cost of the line concentrator from the amount saved in the line plant cost.

In FIG. 3 the speaking current and ringing current is supplied from the battery and ringing source in the remote unit of the line concentrator located in a place distant from the exchange office and which also relays the dial impulse as that this type is used for subscribers located a long distance from the exchange oflice. This equipment makes liaison with the exchange oce plant entirely by means of a single line operation, therefore, compared with an ordinary line concentrator its use can be extended as far as about double the distance; its compensation for the current supply loss is achieved by the provided local power source; it makes the identification of a two-party line easy and the transmission of discriminating signals to and from the exchange otce simple; relaying of the dial impulse is performed as a both lines impulse to ensure reliability; it needs only 4 relays in the trunk circuit; it involves almost no change in the common control circuit from that above described, and is rather simplified and stabilized in operation due to the use of relay BL5 in place of a discharge tube GL5. Details on these different points are given Ibelow.

(5) Originating calls (va remote nnl of FIG. 3).- When connected to the calling subscriber T5 is put into operation through the subscriber loop to supply the speaking current and makes intermittent operation due to the dial impulse and by the rst release B5 operates and remains in operation during a series of impulses. Impulse is sent over both lines to ensure operation via groundr-t'5-b"5 wire, and also via battery-r'o-t'5-b"5 wire. Relay P operates for a party of a two-party line as described before, but as the distance from the line concentrator to the subscriber is very short, therefore, the grounded neutral system is enough. However, the operation is better if coupling through about 100 to 200 ohms is made Abetween break contacts of the make before break earth contact placed in the telephone dial. When P'5 operates once the wire alone is grounded to cause P5 in the exchange oice side to be put into operation. When a holding magnet, for instance, HM'5 operates once it sets up a holding circuit by the route of battery-r'1-hm5- :i5-ground, and opens its own operating circuit, that for other holding magnets used in the same trunk circuit, that of relay A, and the starting and holding circuit for the Order Selective Circuit, and the holding circuit for individual group relays as well. The loop for the exchange oflice side is set up via wire-b"5-p5-;"2-hm5-t5 P5-b"5(|) wire, but in this loop P'5 does not operate and acts as an impedance to enhance transmission eficiency during the conversation.

(6) Terminating calls for FIG. 3 Trunk relay T5 releases when the trunk concerned is connected tothe called subscriber, then B5 operates to cause signal source SS to start, and ringing is sent to the called subscriber, and also ring back tone is sent back to the calling subscriber through condenser Cb. When the called subscriber answers, T5 operates by the route of battery-hm5-T5-P5- p'5-XB wire SB subscriber-SB wire XB-p"5-t5-SSb"5-ground, and makes P'5 inoperative. Condenser Cb is of the same capacity as Cb and is for balancing the speaking circuit, but during relay of the dial impulses it acts on the impulse contacts to quench the sparks. To one party of a two-party line battery comes from the automatic exchange to (4,-) wire to operate relay P5 by the route of battery (1) wire-.-b5 .-P'5t'5-QP-ground therefore, the send-out direction of ringing to the called subscriber is reversed, and the wanted subscriber alone is called up. For a terminating call to the other co-subscriber battery from the automatic exchange is absent on (l-) wire, therefore, relay P5 will not operate.

(7) Release for FIG. 3.--When the calling subscriber hangs up his handset, T5 is released and B5 operates, but the loop on the exchange ofce side is opened, the holding magnet H5 on the exchange oflice side is released, and while K5 is releasing (-l) battery of 150 v. is sent through wire, the relay RL5 operates by the route of l battery or 150 v. wire-ts-ItLs-Q-Q'I-Q-ground and HM5 is released. Accordingly, B"5 is also released. In the case of the called subscriber, even when the handset is hung up the exchange ofce side is opened, but ground is lost on the RT wire upon the calling subscribers hanging his handset up, thus ending in a release the same as before.

(8) Suspension of originating calls-The separate suspension of originating call which has been touched upon in the case of originating calls under heading (l) above will be described in detail. FIGURES 12 and 13 show detailedly a part of the trunk circuit of FIG. 6; FIG. 14 shows the originating call stop circuit which is inserted into the circuit of FIG. 6 or 13 (or into the circuit of FIG. 5 as hereinafter described) by plugging into the jacks I1 and J3 as will now be described. A duplex head plug connected with a pair of wires is inserted between jack J1 (FIG. -6 or 13) and jack I4 (FIG. 14) so as to insert the relay V in the circuit of jack Il, and a duplex head plug of single line is inserted bet-Ween jack J3 (FIG. 6 or 13) and jack I5 (FIG. 14). In the case of originating calls when the trunk Tr5 is connected to selector SEL of the automatic exchange, the contacts b5 and H5 are in the operating condition, so the high-resistance slow-release relay V enters into the (l-) wire and V operates, but relay A of SEL cannot operate. Even if dial impulse is sent, V is not released and A will not operate. The ground is sent from jack J5 to jack J3, the RT wire of the line terminal CTI is grounded, therefore this trunk and this subscriber line are kept lbusy for the other call. To the calling subscriber is sent busy tone BT or information INF, that explains the reason why originating call is impossible by a tape-recorder. In this case of one of the two-party line subscribers, if the calling subscriber does not fall under the said explanation, the wire of the subscriber line is grounded automatically at the beginning and the end of sending each dial impulse train, the two-party line discriminating relay P5 of differential Winding operates by its single winding together with relay A of the selector SEL making a holding circuit of relay P5 by ground on the RT wire, relay V is released on being removed off the impulse circuit, and ground on the RT wire is sent from SEL so that a normal connection may be set up. In cases jack J2 is used in place of jack I1, when the holding magnet H5 operates, the calling subscriber is extended to SEL; ground is sent from the RT wire of SEL before B5 is released and a normal connection is immediately set up, but an originating call from a co-subscriber of the two-party line grounds either wire or both wires automatically at the beginning and the end of sending each dial impulse train, and relay P5 operates to retain and relay V operates, then relay A of SEL which operates by the loop of the calling subscriber is released by the rst break contact of the dial impulse and after that even though A of SEL makes operation by single wire ground of dialling, this A relay releases again during the transmission of dial impulse due to the high resistance of V. The calling subscriber after hearing the lbusy tone or the information of originating call suspension Will hang up his handset. Ground on the RT wire is, as is aforementioned, sent from jack I5. In FIG. 12 the make contact of H5 indicates h5 alone of the parallel circuit composed of the four make contacts, h5, 1110, 1115 and i125. In the case of the circuit of FIG. 5, when relay V is inserted into jack I2, A of SEL operates for the originating call suspended but, when dialled, it is released and this subscriber cannot be connected to, and BT tone, INF, are heard; other conditions are as aforementioned being similar to the foregoing explanation in case V is inserted into jack I2.

(9) Glitters-FIG. 8 is the case wherein no origination suspension is carried out on the exchange office side; in this case, originating call discriminating relay B5 has twostep operation; an idle line for the automatic exchange is hunted in the first step operation; it is stopped on the idle line in the second step; a temporary loop is set up for the automatic exchange with resistance ro; ground is sentv from the automatic exchange to the RT Wire; when holding magnet H5 operates, trunk relay K5 operates, and the loop for the automatic exchange is extended to the calling subscriber. The cross contacts of the crossbar switch will decrease by two, but if it is for individual line, the cross contacts for M1 and M2 are also unnecessary.

FIG. 10 shows the circuit for making a simultaneous test using AC power supply SG and rectiiiers QCl QC.; in order to identify 2 groups by means of one control line c1, and another 2 groups by means of the other control line C2, that is, with the current in the same direction the common control lines C1 and C2 make test of one group each, and with that in the opposite direction C1,

and C2 make test of another one group each. For SG may be employed a commercial frequency of such as 50 60 cycles, and this feature is advantageous in not requiring contacts when detecting four groups of subscribers with a pair of common control lines.

The present device having been provided `with contact such as x1, x2, it is also possible to detect four groups of subscribers when these contacts are employed either in the case of FIG. lO and FIG. 11, even though no AC current is used, although there seems to be a question, though minor, in maintenance since there run chargings and leaks, thereby wearing the contact x1 or x2, even if the calling subscriber does not lift up his handset. But it is very exact in operation. In FIGS. 10 and 1l, the arrangement is such that when trunks of groups l and 2 are all occupied AE1 is made operating; the group relay circuit is opened; a busy tone is sent by C1; when trunks of groups 3 and 4 are all occupied, A32 operates; the group relay circuit is opened; and a busy tone is sent out through C2, but it can be so arranged that, by providing AE1, AB2, AB3, and A54 and by using two kinds of busy tones of different intermittent numbers, the one group relay is cut off and a busy tone is sent out to the subscribers thereot` if and when the trunks belonging to one group are all occupied. If it is the case of only two groups into which the crossbar switch is divided, it will be so arranged that the battery is connected to either G01 or G03 directly or the battery is connected to either Go2 or G04 directly, and S] to S4, GSI to G54 and G1 to G4 are respectively reduced to 2. The crossbar switch used in the present invention is provided with a break contact at the cross contact and is so composed that the break contact for the subscriber lines will operate by the operation of a holding magnet, so that this is very reliable as well as very small in size. This type of cross-bar switch, but not the dividing thereof, is disclosed for example in the U.S. patent to Torisu issued Nov. 22, 1960, No. 2,961,493.

(10) As the foregoing explains, the present invention is applicable as a line concentrator for any automatic exchange, the circuit being simple, the operation being reliable and the equipment small-sized, and the range of usage being Wide i.e. from small capacity to large capacity. Since a remote unit can be installed at a point considerably distant from the office, it is possible to render exchange service by concentrating circumferential small oflices to which individual toll rates are applicable in one exchange oihce, which is extremely advantageous in maintenance as well as from the standpoint of management. Particularly, in the step-by-step type automatic exchange, there will bc almost no increase of the total expenditure for the line concentrator and the automatic exchange equipments from which are eliminated line relays, cut ofi. relays, line nders (or line switches) and some part of the main distributing frame, etc., due to using the line concentrator. An outstanding feature of this invention is that the required number of trunks is freely and easily changeable according to the call volume of subscribers. The system also is convenient in the billing of charges since it enables that two-party lines to be discriminated With only one relay, separate `call registrations to be performed, and separate suspensions of origination, all being done within the exchange otlice.

What I claim is:

1. A telephone line concentrating system comprising:

(A) an oihce unit and a remote unit of a line concentrator;

(B) a central otiice including an automatic exchange equipment associated with said oce unit;

(C) a plurality of subscribers lines associated with said remote unit and a plurality of subscribers line terminals corresponding to said subscribers lines and associated with said oice unit;

(D) a plurality of trunk lines interconnecting said remote and office units, said trunk lines being less in number than the number of said subscribers lines; and

(E) calling signal responsive means for causing, through selected ones of said trunk lines, calling and called ones of said subscribers lines to be connected to and disconnected from the corresponding subscribers l5 terminals at said otice unit and to be connected to and disconnected from said automatic exchange equipment, said means comprising:

(l) a plurality of common control lines interconnecting said units, said control lines being less in number than said plurality of trunk lines;

(2) at said remote unit, cross-bar switch means for interconnecting said subscribers lines and said trunk lines, said cross-bar switch means comprising (a) a plurality of vertical paths divided into at least two groups, each group including a plurality of vertical paths, said crossbar switch means further comprising (b) a separate group of horizontal paths associated withv each group of vertical paths, each group of horizontal paths including a plurality of such paths and said horizontal paths being individually directly connected to said subscriber lines;

(2') at said remote unit, at least one of the vertical paths of each group being connected in multiple to one of the vertical paths in another of said vertical groups to constitute a vertical path set, and at least one of the vertical paths of each of said groups being free of interconnection with vertical paths of any other group and itself individually constituting a vertical path set; and

(2) at said remote unit, a number of trunk circuits, each connected to one of said trunk lines, and connected respectively, one to each of said vertical path sets;

(3) at said office unit, cross-bar switch means for inter-connecting said trunk lines with said subscriber line terminals, said crossbar switch means comprising groups of vertical and horizontal paths corresponding to those at said remote unit, with said subscribers line terminals directly connected to the horizontal paths at said oce unit in correspondence with the connections of the subscribers lines at the remote unit;

(3') at said office unit, the vertical paths of said groups being connected in sets corresponding to those at the remote unit;

(3) at said office unit, a number of trunk circuits corresponding to those at the remote unit and connected at said oce unit in correspondence with the connections of the trunk circuits at the remote unit; and

(4) at said remote and office units, common control circuit means connected to said control lines and said cross-bar switch means and responsive to subscribers line and terminal identifying signals passed thereto from said subscriber lines and from said automatic exchange equipment for determining the groups of horizontal and vertical paths with which the signal identified subscriber line and terminal are associated, for selecting one of the paths of the so determined group of vertical paths that is connected to a non-busy trunk line in accordance with a predetermined operating order, for operating Said cross-bar switches to interconnect the so identified subscriber line and terminal through the so selected trunk line, for applying a hold to the circuit thus established, and for disconnecting the circuit thus established from said common control circuit means,

(5) the cross contacts of said cross-bar switches including normally closed contacts as well as normally open contacts, and said signal responsive means being put into operation by a signal passed thereto from a calling subscribers loop via the circuit afforded by said normally closed contacts pending operation of said cross-bar switches.

assenza 2, A telephone line concentrating system according to claim 1, wherein said signal responsive means (4) comprises a trunk relay associated with each of said trunk circuits and a chain circuit means of said olce unit comprising contacts of the trunk relays thereat for determining the operating order of the trunk circuits of each of said groups.

3. A telephone line concentrating system according to claim 1, wherein said signal responsive means comprises, at said oce unit, a rotary switch means associated with each of said trunk line circuits ahead of its connection to the subscriber line terminals at said office unit, said rotary switch means being operatble for connecting said trunk circuit to a selector of said automatic exchange equipment.

4. A telephone line concentrating system according to claim 1, said cross-bar switches having selecting magnets for the horizontal paths therein and holding magnets for the vertical paths therein, and wherein the order selectin circuit of said signal responsive means (4) comprises the selecting magnets f said cross-bar switches.

5. A telephone line concentrating system according to claim 1, wherein the system at said ofhce unit comprises a two-party relay .for making service discriminations between the parties of a two-party subscriber line, and Wherein said two-party relay is connected to one of said trunk circuits between said trunk lines and the cross-bar switch at said Oliice unit.

6. A telephone line concentrating system according to claim 5, wherein the equipment at the office unit comprises means for suspending origination of calls, and means for connecting such cali suspending means into the horizontal path at the cross-bar switch which is connected to the subscriber terminal for which origination of calls is to be suspended.

7. A telephone line concentrating system according to claim 6, wherein said call suspending means is associated with a two-party line terminal of said cross-bar switch and is connected to be rendered operative or inoperative in accordance with the position of said two-party relay.

References Cited UNITED STATES PATENTS 2,358,095 9/1944 Parker 331-112 2,362,551 1l/l944 Harrison 355-113 2,850,577 9/1958 Krom et al 179-183 2,921,139 1/1960 Krom USL-18.3 3,190,968 6/1965 Krom 179-183 3,022,382 2/1962 Ewin 179-183 3,217,107 11/1965 Schorurn 179--18-3 KATHLEEN H. CLAFFY, Primary Examiner.

LAURENCE WRIG HT, Emmi/1er. 

